export interface Grade {
	grade_id: string;
	grade_name:  string;
	room_id:  string;
	room_text:  string;
	subject_id:  string;
	subject_text:  string;
}
export interface Room{
	room_id:string;
	room_text:string;
}
export interface Subject{
	subject_id:string 
	subject_text:string
}
export interface Add{
	grade_name:string
	room_id:string
	subject_id:string
}
export interface Del{
	grade_id:string
}
export interface Update{
	grade_id:string
	grade_name:string
	subject_id:string
	room_id:string
}
